Real Time Communications Engineer

As an RTC / Voice Streaming Engineer, you will be responsible for building and optimizing real-time voice infrastructure with a focus on low-latency audio streaming and CPaaS integrations. Your expertise in Node.js and WebSocket audio streaming will be essential for integrating Exotel bi-directional WebSocket audio bridges with full observability, ensuring ultra-low-latency performance. You should have at least 3-7 years of experience in low-latency media engineering and strong proficiency in Node.js for real-time audio pipelines. Hands-on experience with WebSocket audio streaming (PCM16/16k) and knowledge of handling back-pressure, chunking, and silence detection are required. An understanding of RTP/SIP basics for telephony integration and proven experience in implementing barge-in for TTS/ASR pipelines will be beneficial for this role. Experience in production-grade integrations with CPaaS providers like Exotel or Twilio Media Streams is necessary. Familiarity with Exotel Stream/Voicebot applets and the ability to wire uni-directional streams for agent assist, call recording, and monitoring are also key requirements. You will be expected to focus on performance and observability by exposing metrics such as one-way delay, jitter, packet loss, and MOS. Keeping the median one-way latency within the range of 150-300 ms following ITU-T G.114 standards and building fallbacks for network degradation are crucial aspects of the role. Additionally, deep knowledge of WebRTC internals, experience with AEC (Acoustic Echo Cancellation), NS (Noise Suppression), PLC (Packet Loss Concealment), and audio DSP knowledge for optimizing quality in low-bandwidth conditions are considered nice-to-have skills for this position. The engagement is for a duration of 60 days with the possibility of early completion. The successful completion of the project within this timeframe involves delivering a production-ready WebSocket bridge with full observability and fallback routes meeting G.114/P.800.1 performance benchmarks. This is a contract role based in Bangalore, with the option for hybrid work. Freelancers are welcome to apply as long as they can meet deadlines and SLOs. If you have the required skills and experience in real-time communications and voice streaming, we look forward to receiving your application for this exciting opportunity.,